At least to 1980, a landowner had no duty at common law to do anything with regard to a natural water course. This became know as the “natural watercourse exception” and is set out in Neath Rural District Council v. Williams, [1951] 1 K.B. 115, where at 120 the court stated: A landowner is not at common law under any liability to do anything with regard to a watercourse if it is a natural watercourse which flows through his land…
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